Linked Life Data

2421778

Source:http://linkedlifedata.com/resource/pubmed/id/2421778

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1986-5-23
pubmed:abstractText
A partially purified insulin receptor preparation from rat liver was incubated at 37 degrees C with and without the protein-disulfide interchange enzyme, glutathione-insulin transhydrogenase (thiol: protein-disulfide oxidoreductase/isomerase, EC 1.8.4.2/5.3.4.1). Insulin-binding activity was then assessed by crosslinking receptor-125I-insulin complexes and subjecting them to electrophoresis on SDS-polyacrylamide gels in the absence and presence of reductant followed by autoradiography. Prior incubation of the receptor at 37 degrees C in the absence of the enzyme markedly decreased the subsequent binding of 125I-insulin to the holoreceptor (Mr 350 000) and to its subunits (Mr 180 000 and 130 000), while addition of the enzyme to the preincubation medium served to substantially prevent this decrease. The loss in binding at 37 degrees C was not restored by subsequent addition of the enzyme, nor was the loss prevented by any of the several known inhibitors of proteolysis. The apparent stabilization of receptor by transhydrogenase, as evidenced by the increase in binding above control levels, was proportional to both the enzyme concentration and the duration of incubation. These effects seem to be specific for transhydrogenase, since several other disulfide-containing proteins were found to be ineffective. These data suggest that the stabilization of the subunit structure of the insulin receptor at physiological temperatures may take place via a disulfide interchange reaction catalyzed by glutathione-insulin transhydrogenase.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
http://linkedlifedata.com/resource/pubmed/chemical/Antipain, http://linkedlifedata.com/resource/pubmed/chemical/Aprotinin, http://linkedlifedata.com/resource/pubmed/chemical/Ethylmaleimide, http://linkedlifedata.com/resource/pubmed/chemical/Insulin, http://linkedlifedata.com/resource/pubmed/chemical/Isomerases, http://linkedlifedata.com/resource/pubmed/chemical/Leupeptins, http://linkedlifedata.com/resource/pubmed/chemical/Macromolecular Substances, http://linkedlifedata.com/resource/pubmed/chemical/Oxidoreductases, http://linkedlifedata.com/resource/pubmed/chemical/Protein Disulfide Reductase..., http://linkedlifedata.com/resource/pubmed/chemical/Protein Disulfide-Isomerases, http://linkedlifedata.com/resource/pubmed/chemical/Receptor, Insulin, http://linkedlifedata.com/resource/pubmed/chemical/leupeptin
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
0006-3002
pubmed:author
pubmed:issnType
Print
pubmed:day
22
pubmed:volume
870
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
502-9
pubmed:dateRevised
2011-11-17
pubmed:meshHeading
pubmed:year
1986
pubmed:articleTitle
Stabilization of insulin receptor subunit structure by glutathione-insulin transhydrogenase.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.